That makes sense. Even cooperating across short time frames might be problematic - "I'll stay in bed for 10 more minutes, even if it means that me-in-10-minutes will be stressed out and might be late for work"

I prefer to see long-term thinking as increased integration among different time-selves rather than a sacrifice, though - it's not a sacrifice to take actions with a delayed payoff if your utility function puts a high weight on your future-selves' wellbeing.