I don't usually trust anyone elses' herbal blends. Odds are they're perfectly safe but what I know is that you'll sleep better when you begin studying individual herbs on their own; I like Valerian, Eleuthero, Lavender, Hops & veggie-sourced melatonin tablets (3mg), but when your homework truly begins you'll probably find compounds suited best to you. Kava-kava is another favorite of mine, it's a muscle relaxant.
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"Standing on a well-chilled cinder, we see the fading of the suns, and try to recall the vanished brilliance of the origin of the worlds."
-Georges Lemaitre
"I fly through hyperspace, in my green computer interface"
-Gem Tos