Starry Night Sleep Calculator
Discover your perfect bedtime based on natural sleep cycles
Your Ideal Bedtimes
For optimal rest, aim to fall asleep at one of these times:
Each option represents a complete sleep cycle (approx. 90 minutes). Waking up at the end of a cycle helps you feel more refreshed.
Understanding Sleep Cycles
Quality sleep consists of multiple cycles through different sleep stages. Here’s what you should know:
Sleep Stages
Each cycle includes light sleep, deep sleep, and REM sleep. Deep sleep is most restorative, while REM is when dreaming occurs.
Cycle Duration
A complete sleep cycle typically lasts 90 minutes, but can range from 80-110 minutes depending on the individual.
Optimal Cycles
Most adults need 5-6 complete sleep cycles per night (7.5-9 hours) for optimal health and cognitive function.
Sleep Hygiene
Maintain a consistent schedule, limit screen time before bed, and create a restful environment for better sleep quality.