Night time itching ?

if not parasites, could be hydration (i doubt it. you seem too smart not to stay hydrated), hormones (strong correlation with nighttime itching, we make less hormones at night), a lifestyle factor (something your eating, drinking, coming into contact with) or an underlying health condition such as an autoimmune problem.

because of the range of possibilities, a doc is the best bet to suss it out quickly.

my first suggestion would be to stop using all soaps in the area and use a natural oil (sweet almond, coconut, etc...) instead of any creams/lotions after washing gently with lukewarm (never hot) water only. of course some soap may make brief contact when you bathe (shower preferred for this reason), just don't apply any detergents or creams directly to your arms or use a washcloth in the area, then pat dry. also you might consider using only scent and dye-free laundry detergents and softeners. that would be ideal in ruling out contact dermatitis, and it would give your skin a complete break to heal.

Do you think you might have some kind of contact dermatitis? You might want to use soaps which have no dyes or perfumes. Also, don't use any scented laundry soaps or perfumed dryer sheets. Your diet could play a part, too. No caffeine might help. Instead of the itch cream, you might try a moisturizing skin cream, like Cera/ve. It does a better job on my eczema than the topical corticosteroid the dermatologist prescribed.

I hope you can pin down the cause, and feel better soon.

I was low on vitamin A and had a lot of itching and dry skin. One of my doctors told me to start taking it even though I didn’t complain about that. The bumps on my arms disappeared, my skin wasn’t itchy any more and the cracks and callouses on my heels disappeared to. All of it due to low Vitamin A. I take a good beta carotene supplement and a filtered fish oil supplement every day now. I also started using a facial serum with Retin A in it and that has helped.

Have you switched soap/shampoo/laundry detergent etc? Have you eaten something new? Are you getting enough water? It’s likely environmental. I go through periods like this when my skin is more sensitive than other times. Usually I’ll take an antihistamine and it goes away

Dehydrated, or just really dry air. or switched laundry detergent recently

I would try an antihistamine before bed.
Check this out https://my.clevelandclinic.org/health/diseases/24338-itchy-skin-at-night

Could be fleas if you have pets?

I was at work the other day and my arm got itchy like I had just been bitten by a bug. With itching it got puffy like a bug bite but no bugs in sight. Got the same thing on my thumb on opposite hand.

Relative living downstairs has cats am thinking it's fleas.

Maybe you could change your detergent?

Could be an allergen, what are you eating for dinner?

Might be allergic to your bedding or pillows. Do you use feathers in any of them?

Wash your bedding once a week.

your soap?

Fleas?