Generally, eating well will help with your sleep. If you stuff yourself with garbage and lie down, you shall wake up and feel awful. If you eat acidic food or things that induce GERD you are also likely to wake up with indigestion roughing up that work you have done to sleep properly. Eat clean and separate your last meal form bedtime by 3 hours or more to allow for digestion.
Limit or avoid alcohol entirely! Sorry, but drinking alcohol is NOT helping your sleep. Similar to anti-anxiety drugs and sleep aides, alcohol increases GABA receptors in the body signaling to the brain to calm down and eventually limiting consciousness.