skin itching/crawling sensations all over body only happening at night at bedtime

curious what is contributing to the itching crawling sensations I get all over my skin only at night when im trying to fall asleep. I'll go the entire day without many issues or symptoms at all, but once I try to fall asleep around 10:30/11 p.m., I get the restless feeling of having itching and crawling sensations all over my body. I'll then fall asleep probably an hour later and then keep waking up throughout the night. would this be classified as a histamine dump, and if so, what is contributing to it? how can I prevent this from happening and what can I do when it happens if I don't tolerate antihistamines (the fillers/agents in them make me itch more)?