I bought a gadget yesterday after I saw a hairdresser using one on a bride and didn't want to recommend it until I had tried it out myself and had seen how long it lasted. It's a bit pricey but very good!
It is called Babyliss Curl Secret Styler and it is so easy to use. I used to do it with GHD's but can't do the back of my hair as well and find my arms ache.
Here is a Youtube video to show you what it's like https://www.youtube.com/watch?v=5FJOsTg6D_w. I slept on the curls last night and my Sister in law commented today that is was still curly today. Thought if you didn't want to pay £100+ for a hairdresser then you might want to treat yourself to this?
I would always recommend a pro hairdresser because they do a fab job and you can relax but I'm just recommending this to people who don't want one.
Hope it helps someone.