My belly picture<3 18weeks & 3days pregnant. I got up at 1:55am... ate me a couple oranges and didnt…

My belly picture<3 18weeks & 3days pregnant. I got up at 1:55am... ate me a couple oranges and didnt go back to bed til 8am ugh these no sleep things killing me. I am so tired. Does anyone know if I can take anything to keep me a sleep??? This is an every night thing since i hit about 16weeks...can anyone recommend me anything thats safe to take while pregnant?