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睡眠周期计算
从起床时间按 90 分钟睡眠周期往回推算，找出最佳入睡时刻。
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How to use it
1Step 1Fill in Wake-up time
2Step 2Change a value and the result updates instantly
3Step 3Save or copy the result
If the result looks off
The result looks wrong
Check the units and the baseline first. Changing a value updates the result instantly.
I want the starting values back
Press reset to return to the initial state.
常见问题
Why 90 minutes?
One REM-plus-non-REM cycle is about 90 minutes, so waking at a cycle boundary feels easier.
Does falling asleep time matter?
Yes — the minutes you need to drift off are subtracted before counting cycles.