Ten affirmations for low energy days — for the mornings you wake up already tired, and permission to let one small thing be enough.

Some days start empty. Not sad exactly, not ill exactly — just running on less than you need, with the same list you had yesterday and none of the fuel. And then the second problem arrives: the guilt about the first one.
These ten affirmations are aimed at the guilt more than the tiredness. What you did today was probably enough. Believing that is what stops a low-energy day turning into a low-energy week.
Pick one thing. Say the affirmation, do that one thing, and let the rest wait. A tired day that produces one finished task ends far better than one that produces four abandoned ones and an evening of self-criticism.
Watch out for the recovery trap: pushing hard on a day you have nothing to give usually buys you two worse days after it. Slower now is genuinely faster across the week.

1. “I decide how much or little I can do today.”

2. “Everything I did today was enough.”

3. “What I have done today is enough.”

4. “I am tired today. I am unsure today. And I am still showing up today, which is the only thing that has ever moved me forward.”

5. “I am doing all I can today, and everything else can wait until tomorrow.”

6. “I did my best today and now I rest.”

7. “Today I am doing the best that I can.”

8. “I rest today so I can wake up energized tomorrow.”

9. “I am doing my best today.”

10. “I did my best today and I am ready to rest.”
Choose one task and let it count as the day. One finished thing protects tomorrow; four half-finished things and an evening of guilt do not.
No — and the question itself is usually the tiredness talking. Resting on a low day is what makes the next day usable, which is why it tends to produce more over a week rather than less.
"What I have done today is enough." It is aimed at the guilt rather than the fatigue, and the guilt is the part that makes tiredness genuinely unbearable.
If it lasts for weeks, does not lift with rest, or comes with other symptoms, that is worth a doctor rather than an affirmation. Persistent fatigue has plenty of physical causes that are very treatable.