One of the consequences of anxiety is insomnia, inability to fall asleep.
The first thing to remember is that the more you worry because you cannot fall asleep, it will be worse. Numerous and disturbing thoughts are nasty enough in the daytime, and at night almost unbearable. Reduce caffeine and have a normal sleeping schedule. Watch TV if you aren’t sleepy yet and don’t think about “what if…” questions. If you survived the day then you will survive the night too, no point thinking about it. Just focus on sleeping 🙂