I took 800mg of ibuprofen at once. Will it help me sleep?
Ibuprofen is not a sleeping drug so it will not help you sleep. It's a nonsteroidal anti-inflammatory drug and helps relieve pain. One of its side effects is sleeplessness so you will probably be up all night.
Yes, prescription strength, which is what I'm on myself, can make you drowsy/sleepy and sometimes dizzy.
Not unless it has P.M. on the bottle.