By Ariel Klein When I was a teenager, sleeping until the early afternoon was effortless—as a matter of fact, I think it was nearly impossible for me to get anything less than 10 hours of uninterrupted sleep. But as I got older, I noticed my body would naturally wake itself up at 6:30 a.m., and getting back to sleep was completely hopeless. Now that I’m in my 30s, my sleep patterns have changed so drastically that “sleeping in” means waking up by 8 a.m.