Greetings from HealthcareMagic!
I understand your concern.
Swelling in arms &hands whole sleeping can be due to-
1. Faulty sleeping posture/exposure to cold
2. Small joint swellings in hand/inflammation or water retention ( indicating liver
or heart problem needs to be examined by expert &investigated as per need),
3. High sodium intake
4. Your husband needs consultation of your family physician & primary investigations to locate basic cause followed by expert referral as per need.
5. Till then-avoid pressure over hand while sleeping/avoid exposure to cold &cover hands with warm cloth while sleeping/reduce sodium salt intake .
Take specific treatment off causes a per advise.
Dr. Vasudha Jayant Athavale,
General & Family Physician