I tend to agree with Heather-ak. Camping is a necessary evil for me. I am a side/belly sleeper at home and that's difficult in a sleeping bag. I often take 1/2 of a Unisom to help me sleep and I feel totally fine in the morning. Benadryl does not help me sleep, and I do feel awful the day after taking it, so maybe the people who have a "hangover" are just taking the wrong thing for them? Anyway, to each their own, HYOH and all. But if I'm in a group and people can't get moving the next morning, that WOULD be annoying.