General Information + Treatments for Delayed Sleep Phase and Non-24
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The Circadian Sleep Disorders Network has preferred an excellent database of descriptions, definitions, and treatments pages for more details, and print out our brochure, fact sheet, and/or Q&A documents to give to others.
What Are Circadian Rhythm Sleep Disorders?
Circadian Rhythm Sleep Disorders (CRSDs or CRDs) are neurological disorders in which the sleep-wake cycle is out of sync with the day-night cycle. These include in particular Delayed Sleep Phase Disorder and Non-24-Hour Sleep-Wake Disorder. Also included are Advanced Sleep Phase Disorder, Irregular Sleep Wake Disorder, and Shift Work Disorder, which are defined here.
Delayed Sleep Phase Disorder (DSPD), also called Delayed Sleep Phase Syndrome (DSPS), is characterized by an inability to fall asleep until very late at night, with the resulting need to sleep late in the morning or into the afternoon. Questions? See our DSPS Q&A.
Advanced Sleep Phase Disorder (ASPD), also called Advanced Sleep Phase Syndrome (ASPS), is the opposite. It is characterized by falling asleep very early in the evening, and waking up in the wee hours of early morning, unable to sleep further.
Non-24-Hour Sleep-Wake Disorder (Non-24), also called Free-Running Disorder (FRD), is a condition in which a person's day length is significantly longer than 24 hours, so that sleep times get later each day, cycling around the clock in a matter of days or weeks. Questions? See our Non-24 Q&A.
Some people use the term reverse sleep, referring to the fact that sometimes people with DSPD and Non-24 end up sleeping during daylight and being awake at night.
What Are Circadian Rhythm Sleep Disorders?
Circadian Rhythm Sleep Disorders (CRSDs or CRDs) are neurological disorders in which the sleep-wake cycle is out of sync with the day-night cycle. These include in particular Delayed Sleep Phase Disorder and Non-24-Hour Sleep-Wake Disorder. Also included are Advanced Sleep Phase Disorder, Irregular Sleep Wake Disorder, and Shift Work Disorder, which are defined here.
Delayed Sleep Phase Disorder (DSPD), also called Delayed Sleep Phase Syndrome (DSPS), is characterized by an inability to fall asleep until very late at night, with the resulting need to sleep late in the morning or into the afternoon. Questions? See our DSPS Q&A.
Advanced Sleep Phase Disorder (ASPD), also called Advanced Sleep Phase Syndrome (ASPS), is the opposite. It is characterized by falling asleep very early in the evening, and waking up in the wee hours of early morning, unable to sleep further.
Non-24-Hour Sleep-Wake Disorder (Non-24), also called Free-Running Disorder (FRD), is a condition in which a person's day length is significantly longer than 24 hours, so that sleep times get later each day, cycling around the clock in a matter of days or weeks. Questions? See our Non-24 Q&A.
Some people use the term reverse sleep, referring to the fact that sometimes people with DSPD and Non-24 end up sleeping during daylight and being awake at night.
Details
Resource type
Websites and Applications
Disabilities
Circadian Rhythm Disorders
Age
0-99
Eligibility
N/A
Location
Regions
Cariboo Chilcotin Coast, Fraser North, Fraser South, Fraser Valley, Greater Vancouver, Kootenays, North East, North West, Sunshine Coast / Squamish-Lillooet, Thompson Okanagan, Vancouver Island Central, Vancouver Island North, Vancouver Island South
Cities
108 Mile Ranch, 150 Mile House, 70 Mile House, Abbotsford, Agassiz, Ainsworth Hot Springs, Aldergrove, Alert Bay, Alexis Creek, Anahim Lake, Anglemont, Anmore, Apex Mountain Resort, Appledale, Armstrong, Arras, Arrow Creek, Ashcroft, Atlin , Avola, Balfour, Bamfield, Bankeir, Barkerville, Barriere, Baynes Lake, Bear Lake, Beaverdell, Belcarra, Bella Bella, Bella Coola, Big White Ski Resort, Black Creek, Blind Bay, Blue River, Boston Bar, Bowen Island, Bowser , Brentwood Bay, Bridal Falls, Bridge Lake, Britannia Beach, Buckhorn, Buick, Burnaby, Burns Lake, Burton, Cache Creek, Campbell River, Canal Flats, Canyon, Castlegar, Cawston, Celista, Charlie Lake, Chase, Chemainus, Cherryville, Chetwynd, Chilliwack, Christina Lake, Clearwater, Clinton, Coalmont, Cobble Hill, Coldstream, Colwood, Comox, Coquitlam, Courtenay, Cowichan Bay, Cranbrook, Crawford Bay, Crescent Valley, Creston, Crofton, Cultus Lake, Cumberland, D'Arcy, Davis Bay, Dawson Creek, Dease Lake, Delta, Denman Island, Dome Creek, Donald, Duncan, Eagle Bay, Eagle Creek, Earls Cove, Edgewater, Edgewood, Egmont, Elkford, Elko, Enderby, Erickson, Errington, Esquimalt, Fairmont Hot Springs, Falkland, Fanny Bay, Fauquier, Fernie, Fernie Alpine Resort, Field, Forest Grove, Fort Fraser, Fort Nelson, Fort St. James, Fort St. John, Fort Steele, Fraser Lake, Fruitvale, Gabriola Island, Galiano Island, Gambier Island, Garden Bay, Garibaldi Highlands, Genelle, Gibsons, Gillies Bay, Gingolx, Gold Bridge, Gold River, Golden, Grand Forks, Granisle, Grasmere, Greenwood, Grindrod, Halfmoon Bay, Harrison Hot Springs, Hazelton, Hedley, Heriot Bay, Hixon, Holberg, Honeymoon Bay, Hope, Hornby Island, Horsefly, Hosmer, Houston, Hudson’s Hope, Invermere, Iskut, Jaffray, Kaleden, Kamloops, Kaslo, Kelowna, Kemano , Keremeos, Kicking Horse Mountain Resort, Kimberley, Kimberley Alpine Resort, Kispiox, Kitimat, Kitwanga, Klemtu, Kootenay Bay, Kyuquot, Lac La Hache, Lac La Jeune, Ladner, Ladysmith, Lake Country, Lake Cowichan, Lake Errock, Langdale, Langford, Langley, Lantzville, Lasqueti Island, Likely, Lillooet, Lindell Beach, Lions Bay, Little Fort, Logan Lake, Lone Butte, Lumby, Lytton, Mackenzie, Madeira Park, Malakwa, Manning Park, Mansons Landing, Maple Ridge, Masset, Mayne Island, McBride, McLeod Lake, Meadow Creek, Merritt, Merville , Metchosin, Mica Creek, Mica Creek, Midway, Mill Bay , Mission, Moberly Lake, Monte Lake, Montrose, Moricetown, Mount Currie, Mount Washington Alpine Resort, Moyie Lake, Nakusp, Nanaimo, Nanoose Bay, Naramata, Nelson, New Aiyansh, New Denver, New Hazelton, New Westminster, Newton, Nimpo Lake , North Saanich, North Vancouver, Ocean Falls, Okanagan Falls, Olalla, Oliver, Osoyoos, Oyama, Panorama Mountain Village, Parksville, Peachland, Pemberton, Pender Harbour, Pender Island, Penticton, Pinantan Lake, Pitt Meadows, Port Alberni, Port Alice, Port Clements, Port Coquitlam, Port Edward, Port Hardy, Port McNeil, Port Moody, Port Renfrew, Pouce Coupe, Powell River, Prince George, Prince Rupert, Princeton, Pritchard, Procter, Puntzi Lake, Qualicum Beach, Quathiaski Cove, Queen Charlotte , Queens Bay, Quesnel, Radium Hot Springs , Red Mountain Resort, Revelstoke, Revelstoke Mountain Resort, Richmond, Roberts Creek, Rock Creek, Rolla , Rosedale, Rossland, Royston, Saanich, Saanichton, Salmo, Salmon Arm, Salt Spring Island, Saltery Bay, Sandspit, Saturna Island, Savona, Sayward, Scotch Creek, Sechelt, Seton Portage, Shalalth, Shawnigan Lake, Shearwater, Sicamous, Sidney, Silver Star Mountain Resort, Silverton , Skidegate, Skookumchuck, Slocan, Smithers, Sointula , Sooke, Sorrento, Sparwood, Spences Bridge, Squamish, Stewart, Summerland, Sun Peaks Resort, Sunset Prairie, Surrey, Swartz Bay, Tahsis, Tappen, Tatla Lake, Taylor, Telegraph Cove, Telegraph Creek, Telkwa, Terrace, Tete Jaune Cache, Texada Island, Thetis Island, Thompson Sound, Thornhill, Toad River, Tofino, Topley , Trail, Tsawwassen, Tulameen, Tumbler Ridge, Ucluelet, Union Bay, Valemount, Vancouver, Vanderhoof, Vavenby, Vernon, Victoria, View Royal, Wardner, Warfield, Wasa, Wells , West Kelowna, West Vancouver, Whaletown, Whistler, Whistler Blackcomb, White Rock, Whitewater Ski Resort, Williams Lake, Windermere, Winfield, Winlaw, Winter Harbour, Woss, Wynndel, Yale, Ymir, Zeballos
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