I've been suggesting this need for food energy to sleep for ages. I find that complex carbs or some protein is best. If you can afford it, a low glycemic snack like Glucerna may work well. Otherwise, look up the Glycemic Index and choose foods with a low glycemic value. This means they last longer in your system. Be careful. This is also an easy way to put on a few pounds.

By eating the proper food before sleep, I can easily sleep through the night. I routinely wake up at the same time in the morning without an alarm. This is likely due to the food energy being depleted at that time. I make it about 8 to 9 hours since my snack.