So, I take antihistamines before bed so that I don't dream, because when I dream they are always nightmares. however, I am going over to a friend's house for the first time to do an all-night movie marathon with her, so, I don't plan on any sleep, and she has insomnia, however, should I bring the antihistamines in the off chance that I do fall asleep on accident to avoid nightmares?

While it is ultimately up to you to decide whether to bring antihistamines or not, it is essential to prioritize open communication with your friend about the situation. If you anticipate the possibility of falling asleep and would like to avoid nightmares, it might be a good idea to inform your friend beforehand and discuss the idea of having the antihistamines with you. This way, she is aware and can understand your perspective. However, it's important to also consider that the antihistamines might cause drowsiness, which could affect your ability to enjoy the movie marathon and stay awake. Ultimately, discussing it with your friend and reaching a consensus would be the best approach.