Its amazing when you go camping with no artificial lights or internet and soon after dark everyone is yawning and ready to sleep.
I try so hard to replicate it in my normal life because I feel so accomplished when I wake up at 6am and walk down the road to shower and get ready for the day.
We usually stay up talking at least until 11PM and wake up roughly ~7:30AM
What's different about camping is usually the quality of sleep. If you're a nightowl and you get 8.5 hours of really good sleep, you won't be feeling like crap waking up at 7-8 AM.