Non-architectural detail: Blackout lining

[Velvet Drapes at Pottery Barn]

The days are getting longer and the early sunrise makes it harder to sleep in late.  But not with blackout lining! 

I added blackout lining to our curtains a few years ago and they seriously changed my life.  On weekends, it's so easy to sleep until noon without even realizing it.  (That's a good thing.)  I think they also provide some insulating properties, but that's really secondary.

Even though I love them, I didn't fully appreciate how great they were until a string of overnight guests slept in way past their usual wake-up time (thankfully no one missed their flight).  Any detail that enables bad habits like these are okay by me.