All three timers generate interrupts which can wake the processor from sleep (depending on the sleep level). In particular Timer 2 can wake it from a deeper sleep (SLEEP_MODE_PWR_SAVE).
and:
All three timers generate interrupts which can wake the processor from sleep (depending on the sleep level). In particular Timer 2 can wake it from a deeper sleep (SLEEP_MODE_PWR_SAVE).
and: