😴 Sleep Cycle Calculator
Sleep runs in cycles of roughly 90 minutes; waking up near the end of a cycle (rather than in the middle of one) tends to feel easier. Enter a bedtime or a wake-up time to see the cycle-aligned options for the other.
This is a general approximation, not medical advice. Real sleep-cycle length varies by person, age and night (commonly 70-120 minutes), and this tool cannot know your personal cycle length. Use it as a rough planning guide, not a guarantee.
Settings
6 cycles × 90 minutes ≈ 9 hours — a commonly cited full night.