u/Spirited_Film6045

So I have been drinking coffee for awhile now. Back in highschool for around about a month I quit caffeine entirely no caffeine whatsoever. When I started drinking it again for around two weeks I got very strong caffeine buzzes lasting for probably four hours. Eventually my tolerance came back and I didn't quit for probably a year and half. Recently I tried quitting again I went for about two weeks and when I tried caffeine again in the form of an energy drink I felt nothing whatsoever then for the next two weeks I had it only on the weekend and now it kind of makes my heart beat faster but no real energy anymore. Anyone know why?

I decided to take some doxylamine today(Don't worry I do not use it regularly) and I was tired until right before I had to go to work. Basically make sure you have ample time to shake the "hangover" so you're not driving drowsy or anything.

I have been on nightshift for two months now and my sleep has not improved that much. I use a sleep mask and occasionally melatonin. Any ideas to sleep better?