Agree that bed must be meant for sleep but health professionals (as well as literature I've come across) have told me that it's perfectly fine to have toys and a mobile in the crib AS LONG AS you differentiate between "sleepy time toys" and "playtime toys". For us, we use a crib mobile and put a soft plush blue bear into our 6+ mo old son's crib and they work like a charm to signal to him that it's sleepy time. One twist of the mobile and it's off to dreamland he goes as his eyes strain to watch the animals on the mobile before fluttering to a close. And the great thing about having his little blue bear in the crib is that if he wakes up in the middle of the night and he sees it's next to him, he is "reminded" that it's sleep time and the bear comforts him back to sleep. So for us, those two have worked like a charm. Just make sure your bedtime toys are of neutral soft tones, not of loud bright colors that could energize him, not settle him. Mobiles that play lullabies from our experience are fantastic, if used to lull baby to sleep. So don't turn it on during playtime or if he is waking up. Use only for bedtime/naptime routines.