Hi,
Welcome to ehealthforum.
The cramps could be due to your uterus reacting and getting ready for the delivery (a form of Braxton Hickâs of early pregnancy). It usually happens due to stretch effect on the uterus. Consider visiting your gynecologist/obstetrician for a check done to see if uterus is acting. You might need a NST (non stress test) or a CST test. Since it is affecting your rest, do not delay your visit to your treating gynecologist/obstetrician.
Take care.