My heart rate laying down is 48 , i'm no athlete , is this normal?

Maybe and maybe not: Your heart rate is low, whether it is normal or not depends on whether you have symptoms like dizziness, lightheadedness, fatigue, or feeling faint. If you have symptoms then it is not normal if you do not and your heart rate goes up with activity, this maybe normal for you. You should however get an ekg and see your dr. If you have not.