If I'm tired, I sleep. If I'm tired and can't sleep because I have something to do, I drink coffee, and then book some extra sleep time for that night. If I find I'm perpetually tired I take a relaxing vacation - I'm fond of hot springs amongst other things.
Not sure those strategies will work for you, but it's what I've got. My experience is that most people who sleep very little end up regretting it down the road in the form of exhaustion, physical or mental illness, or burnout.
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