If it's ongoing and affecting your life, long term, I'd go and see the doctor, it could be that you have some issues that need resolving. Subconscious activity is surprisingly disruptive to you. I'm not a big sleeper, but when I'm sleep I'm out for the count, albeit only for about 5-6hrs max, but it's good quality sleep.
Exercise and a healthy diet is also critical. As well as reading in bed, and keeping away form the tv/pc before bed.
Crying and defecating is a normal part of sleeping for me anyway.