[scns]

Combined the effect is stronger than each on its own. Caffeine takes ~15 minutes to work. Sadly no source handy but i once read that naps are most effective below 15 minutes. Above it is possible to enter deeper sleep states and wake up worse than before.

[mmsnberbar66]

So when people talk about napping like this, do they ever actually "fall asleep"? I cannot possibly imagine falling asleep in 15m in the middle of my work day or whatever.

[scns]

I don't fall asleep. But just lying in bed, eyes closed, sleepmask on and low Binaural Beats on the ears helps me when i feel a slump. When i set a timer to 12 minutes i usually feel the urge to get up after roughly ten minutes.

[immanentize]

I've done this sort of caffeinated nap when I chugged a cup of coffee and passed out. It feels as bad as it sounds but it was effective.