Eat nuts or lean white meat, NO SUGAR, get a 20 minute or so nap this can be dangerous if you have commitments do not do this unless you have someone who could wake you, but a short nap will revitalise you, caffiene is good also, and take two teabags, make tea with them then let them cool and place it on your eyes, this will reduce puffiness and make you feel wide awake. Trust me on this I do all nighters alot and have studied this shit.
EDIT: keep it on your eyes for 3-5 minutes.