The reason the multi is recommended at bedtime is that is when there is least likely to have the fat-blocking capsules interfere with the absorption of the fat-soluble vitamins A, D, E & K.
Overall, the B-vitamins are compounds that help with the metabolism of protein, carbohydrates and fat. Though they have a few other functions I'm not familiar with anything related to sleep patterns. You might try a powdered supplement - available in Target and WalMart (and probably some health food stores), and see if that helps.
Please let me know if you need anything else.
Pat Baird, MA, RD, registered dietititan