I keep seeing posts about setting alarms for 30 or 45 minutes, and that's just wrong for most people. After testing this for three months with a fitbit, I found that 26 minutes is the sweet spot for me, because anything past that puts me into deep sleep and I wake up worse than before. My buddy in Austin swears by 18 minutes, but he also drinks espresso right after, so I don't trust him. Has anyone else actually tracked their sleep stages, or are we all just guessing with our phone timers?