Work backwards to bedtime
Set the time you have to be up and the hours you want. It counts back, including how long you take to drop off.
22:15lights out
To be asleep by 22:30 and awake at 06:30.
- Start winding down
- 21:45
- Lights out
- 22:15
- Actually asleep
- 22:30
- Time in bed
- 8 h 15 m
Plain arithmetic — wake time, less the hours you asked for, less how long you take to drop off. It makes no claim about what happens while you are asleep, and the right amount of sleep is the amount you wake up feeling well on.
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