Akira wasn't sleeping. He was hiding in the bedroom. For a change, he wasn't holed up in a corner but on the bed. The more that he thought about What would happen when Roku got back, the more he was convinced that he was mad. Akira knew he couldn't escape that because he was in Roku's appartment, but he still couldn't stop himself from trying to hide from that situation. Being completely covered in his pile of blankets might just be an extension for that behaviour, or he just wanted to prevent his face from getting cold.