I've definitely had these...much less now that I've done things to get my overall anxiety under control, but I used to have a very hard time falling asleep and also waking up multiple times at night and the night "terrors" too. Or the almost falling asleep and waking up in a terror feeling as well. Avoiding stimulation and sugar/caffeine/food in general a couple hours before sleep seems to help in addition to all the other things I do in general for anxiety.