Sleeping longer than usual; Normal?

Aidan has been extremely tired the past few days. He's been sleeping about 10 hours a night, & then his naps during the day, which are usually 20 minutes long, have been over an hour long. He is already on his 2nd nap of the day & has been asleep since around 2:30. He doesn't seem sick. Is this normal? Could it be a growth spurt? tia.

My son sleeps 12-14 hours a night. Every kid is different  

That happens from time to time.