I was experimenting and gave myself level 255 speed bonus for 1000000 (basically infinite), I sprinted around fast for a bit and the world was having a hard time loading with it. When I decided it was time to stop I got a bucket of milk and drank it. The drink finished and in the inventory the effects list was empty but I still had the effect and was still traveling just as insanely fast. I decided to try to kill myself after setting my spawn point so I set the time to night, placed down a bed and slept. Ignoring the visual glitch, when the sleep was over, I did not get fully out of the bed. The text menu stayed up, the screen was darkened, and the leave bed button was still there. When I clicked it, the screen jumped slightly as if I moved up slightly but nothing else changed. In the end, I was stuck in the bed screen and still had the particles from the sprint. In addition, before the sprint boost, I did the same thing with 255 jump boost but it didn't work, I got the effect but the jump height didn't change.