I swear by them. Any night I didn’t get any sleep, I take one of those around 7am and I’m good for the rest of the day. Had to do that for my first track day at LRP. Stupid, but I was wired! There really is not crash either, you kinda ease off of it. Also, if I take one around 4pm, I won’t be able to sleep until the wee hours of the morning.