I only have so many blocks around the bed and should wake up beside it no problem, however, I have blocks up against the front/headboard of the bed and spawn there instead, and have to save myself when I sleep. Instead of detecting whether there's blocks in the way, apparently it just ignores it and puts me there anyways?

In the picture below is my setup atm in survival. It places me in the spruce logs at the head of the bed upon waking