Melatonin
"CAUTION with the DOSAGE of this thing. I've seen from 0.3mg to 10mg being sold. Got a really BAD headache the next day when taking 1mg before sleep. Also tried the 0.3mg and got sleepy the next day all, yawing all day long

It really "causes" sleep, you'll feel sleepy, but not relaxed at all. It's not like a benzodiazepine(alprazolam/clonazepam/etc). If you already feel your eyes dry/red and yawning, you don't need this! And try the lowest dose you can find. I'm STILL trying to find something lower than 0.3mg because even that dosage seems too much for me. Have been fighting with my "internal clock" since I was a kid.. it seems my brain always want to sleep later and later... and that feeling that I won't sleep causes me anxiety too"