i cat sleep without moving - whats my problem ?!?

im working night shifts these days so i come back home and during all day my sleep is irrupted

i can sleep for 7 hours then in the evening go to sleep again

or have 3 days off and sleep at night.

either way ive got 2 problems :

1.i cant stop moving from left to right and left to right and left to right about 30 times per hour.

2.sometimes i start etching and its so annoying and never stops.

additional notes :

i sleep of different beds with different pillows all the times but these things happen on each one.

also i wake up every 30 minutes...

whats wrong with me ? i have no stress in my life.