The tone of your post ("or 10 AM if he absolutely needs an extra hour of sleep") indicates to me that you might have an unhealthy perspective on sleep. Sleep is

The tone of your post ("or 10 AM if he absolutely needs an extra hour of sleep") indicates to me that you might have an unhealthy perspective on sleep. Sleep is incredibly important to the consolidation of memory, and research indicates that the vast majority of consolidation might occur around the very last REM cycle! In other words, his creativity, intelligence, and memory will all be improved through extra sleeping.