Lol Brysing sometimes I really love how you put things.
First you should rule out logical conclusions. Go to a doctor and have him run some tests, it could be any number of things from diet to disease that could be effecting your sleep.
If it is a spell, first question is how do you know? Did you just conclude this? It is possible no one cast on you, but your fear got the better of you and have unintentionally done it yourself. Either way a cleansing will get rid of the negative energy. There are many methods to choose from, but a sea salt bath might be the easiest for you, it will cleanse but the bath should also relax you. Try drinking tea with lavender, mint or chamomile, these can relax you and help you sleep better.