My back gets sore after 5 hours of sleep?

Question:

i've been on 5 hours asleep probably since 19(24 now)

im in good shape and my matress if fairly new.

if i sleep for more then 5 and a half hours more when i wake up its sore for about an hour(after i stretch it out and a warm shower)

so whats going on. personally 5 seemed refreshed after 5 hours but i like to sleep in once and awhile without soreness

Answers:
maybe your mattress is too firm or too soft?

My back gets sore after 5 hours of sleep?

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