Sleep Calculator

Sleep Science and Canadian Sleep Guidelines

A single sleep cycle lasts approximately 90 minutes and progresses through four stages: light sleep (N1 and N2), deep sleep (N3), and REM (rapid eye movement) sleep. Waking at the end of a complete cycle — rather than in the middle of deep sleep — is the key to feeling refreshed. This calculator counts backwards from your wake-up time in 90-minute intervals, plus 15 minutes to fall asleep, to determine optimal bedtimes.

The Canadian Sleep Society and the Public Health Agency of Canada report that one in three Canadian adults is not getting enough sleep. Insufficient sleep is associated with increased risks of obesity, type 2 diabetes, cardiovascular disease, depression, and workplace injuries. Sleep hygiene recommendations include maintaining a consistent sleep schedule, keeping the bedroom cool (16–19°C) and dark, avoiding screens for 30–60 minutes before bed, and limiting caffeine after early afternoon.

Recommended Sleep Duration by Age

Consistency matters more than the exact time you go to bed. Shifting your sleep schedule by more than an hour on weekends — known as “social jet lag” — disrupts your circadian rhythm and reduces sleep quality. If you suspect a sleep disorder such as insomnia or sleep apnea, consult your family physician for a referral to a sleep clinic, which is covered under provincial health insurance across Canada.