no baby movement when sleeping to sides.

Yellow mellow
Does anyone have any idea if sleeping to your right or left side is a good idea during your last month of pregnancy. I know a lot of people say it's a good idea to sleep left. But most likely I have been sleeping to my right a lot. Then when I wake up I get less fetal movement or none at all for couple hours. after I eat she then starts kicking and jabbing again. Once she moves it's unbearable movement it just hurts me. Everyday same thing happens. I noticed that when sleeping to my sides my belly gets smaller feels like she's jammed in there. Any suggestions?