Baby and the cot

This is Jake, at 7.5months old. He's definitely growing well and this is him occupying the cot very comfortably (nearly a squeeze already). He's beginning to pull himself up to stand and we have to figure out a safety precaution so that he doesn't fall off. Right now, if he crawls towards the bed where I am, I'll catch him so that he doesn't veer off the bed. However, if he turns to the other side when I'm asleep and should anything happen... *shudder. So yes. We need to have a plan. Pronto.