Hey guys -- I wanted to give yíall an update since you were kind enough to help me.
I went to my doctor, he ran some tests and as it turns out, the itching of my arms at night is caused by an injury (probably doing yoga), more specifically an irritation or compression of the cervical nerves in my neck.
Sounds a bit weird, but after my apt I researched it, and it is, in fact, a very real condition which affects many people.
It happens only at night because my immune system is strong and is able to fight off the itching during the day, but when nighttime falls and I become still (like when I go to bed), my body temp drops which affects my immune system and am unable to fight it off.
He prescribed a cream which helps A LOT.
He said this type of injury will heal on its own, so I just have to be patient.
I canít do yoga until it fully heals, which sucks but hell it could have been worse!!
In any event, I am happy to know itís not more serious.
Thanks again for your help guys!!