 A nap + core sleep = less total sleep
I noticed this several times when I had tried a nap for an hour or 30 minutes in the evening. Usually I have to sleep 8 hours to make it through a day. But if I have a 30 minute nap in the evening (e.g. 6:30 - 7:00 pm), and then go to bed at 11:30 pm, then I can wake up at 6:00 am with ease and go through all the day no problem. This makes a total of 7 hours sleep per day.
Having a 30 minute nap saves 1 hour of sleep per day. This works for me, i can't tell for others, nor did I any research...
Regards,
Andrius
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