Best Sleep App withTimed Naps? (Free or One Off Purchase)

I'm using Pillow (without subscription) I like it's widget design and overall design - £12.99 for 3 months! £51.96 a Year - Nope! - although it does offer power naps via subscription only.

I've also got AutoSleep but it's a bit overboard with squeezing so much info into it's design and doesn't offer power naps.

Is there anything that offers this feature that's either free or a reasonable one time purchase.

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