I feel like we're pushing the limits of B-tier, but then I don't actually know what B-tier even means, so let's keep the ball rolling:
The ability to completely freeze time except for yourself (and magicking away the fine print like suffocating if you froze the the oxygen around your nose/mouth) but ONLY when you're asleep.
5 minute break at work? Lemme just find a comfy chair and BAM 8 hours down the hatch!
Up all night studying and now your final is in two hours? BAM completely rested.
...I guess the catch being that if you overused it (and I totally would) you'd be aging while everything else was on pause, so you'd be like 90 years old physiologically, but only like 60 going by the date.
...which also means you could live your whole life and peace out before the clime wars start!! WOO!
I have this power, and one little caveat of it is how much I crave dozing, ie being awake, sleepy, and cozy but not needing to get up. I guess could just set my alarm earlier but I need the sleep more