What's the best way to draw lying down or tools I need? I can't stand sitting at a desk or standing very long and like to work in bed watching tv on my laptop but I feel like I can't really use my whole arm so I end up just doing wrist drawings and can't do very precision lines at that because laying down makes it difficult.

Would a tablet make it easier? Sometimes I try propping my notebook on my knees but they seem kind of lumpy and it moves around.