Left legs / hands numb/cramps using maternity pillow.

Week 17. I'm using the clevamama maternity pillow sleeping on the left side with legs bent exactly as shown in the pic. But I ended up waking with numbs and cramps despite using a maternity pillow on the left legs and left hands. Am I putting too much pressure/weight on the left hands/legs while sleeping on left position ? As a result I find it very hard to sleep as I keep tossing and turning on bed due to numbs/cramps Is that normal ? Does pregnant and sleeping on left side causes difficulty in sleeping?