Erm, since I'm having a hard time thinking of particularly weird habits I'm going to list whatever habits I can think of - good and bad, weird and normal

• chew on my lips
• pick at my lips
• procrastinate
• stay up ridiculously late
• unless I have somewhere to be (in which case I wake up on time) I oversleep ridiculously late
• crack my knuckles, neck, back, ankles
• I make faces when I read, trying to mimic characters' expressions
• I try to get my finger to my cats' mouths before they finish yawning so they end up biting me - it amuses me