I don't mean this in a depressive way. I mean, losing interest in the activities you once used to do - books, tv, swimming, workouts, etc. You just want to sit in your room and relax. You no longer have interest in activities, you no longer want to socialise. You want solitude and silence.
Is this a good thing or a bad thing? To an introvert like me, it seems natural. But to others, it seems odd.