Braiding your hair after you get out of the shower and it's wet is always nice then in the morning you can unbraid it. This is more for a wave instead of more of a curl though. But without heat it's hard to do anything to your hair, such as curling it . You could also look for a good brand of curl cream for after the shower too. Goes on damp hair and drys curly, scrunching is helpful too!
When your hair is wet grab small sections, make sure it isnt tangled, use two fingers and wrap your hair around them like O's all the way to your skelp then put a Bobby pin to hold it.. You can lightly spray with hairspray to get a better hold when its completly dry take the pins out and its curly =) hope this helps