I'll do my best to explain, it does look a little confusing in retrospect. Let's say for the sake of argument that these cycles are 2 hour blocks: 0-2, 2-4, 4-6

I'll do my best to explain, it does look a little confusing in retrospect. Let's say for the sake of argument that these cycles are 2 hour blocks: 0-2, 2-4, 4-6, and so on. If you sleep 0-2, and wake up at the end of that cycle during the wakeful period between 0-2 and 2-4, you'll feel more rested and have a faster bootup time than if you do 0-3 and wake up midway through 2-4 interrupting a period of deep sleep. You may notice more feelings of fogginess, agitation, and sleepiness, and a longer bootup time as your brain is shifting gears metaphorically speaking. When you first fall asleep, you move through a few stages of sleep until you reach the end at the REM stage. Interrupting this stage is what causes the issue for me. I wake up still dreaming or speaking as I wake up.