Alt text: Star Trek Enterprise scene, Riker is labeled "The last pack of pizza rolls in the freezer" and Data is labeled "Me at 3 AM". Riker is sleeping, some ominous flashing lights start occurring. He looks up, and then looks down the bed in shock. Cut to Data, who is creepily smiling back. Cut back to Riker, who is then pulled slowly down the bed and out of frame, by Data who is off-screen.
Fairly sure that part is from Schisms where Riker and other crew members are being abducted while they sleep by aliens. At this point he knows he’s going to be abducted and has taken some stimulants to stay awake so he decided to get abducted in his uniform rather than his sleeping clothes.
Because you know Riker normally sleeps naked.
Right, and he didn't want the aliens abducting him to be intimidated