Try to learn names as soon as you can. Maybe you don't have this issue, but when someone tells me their name it feels like it goes in one ear and out the other.
I also keep a little cheat sheet with info that people tell me (ie. where they're from, how long they've been here, former roles, former companies, etc.) because that also doesn't last long in my brain when I'm trying to remember everything about a new job. The same goes for work material - take notes so you can reference it later. Also, take a notebook with you to all of your meetings, just in case.
Don't hesitate to ask questions. Sometimes I feel like I should know something, or someone assumes I know something, and I have no idea and I don't speak up and then suddenly it's 3 weeks later and I still don't know what that acronym means.
Like coffeehound said, get enough sleep - it really does make everything easier when you aren't tired.