I am a night owl. I usually go to bed very late and sometimes sleep past noon. Two key enablers to my non-standard sleep pattern are the 'Do Not Disturb' button on my phone, and my Blackout Lined Curtains.
These curtain panels come in several sizes. I have four of the 50" by 108" panels on the main window in my master bedroom. I have two of the smaller panels serving more of a decorative function in a guest room. In the guest room, I am taking advantage of the supplied tie backs.
While the soft flexible black out lining is not as heavy as the vinyl linings you might see in some hotel curtains, they definitely do cut off the light, reduce drafts, and provide temperature and sound insulation. They also provide the ultimate amount of privacy.
As with any curtains, the nominal width of the panel is greater than the linear coverage provided. My four 50" panels are covering about 110" of drapery rod. Also, in order to get the most blackout effect, you want to have a good amount of overlapping of curtain past all the window edges (sides, top, and bottom).
They keep the room:
Warmer in the winter
Cooler in the summer
Darker in the daytime
Lighter in the night time (no, just kidding on this point)
These curtains are polyester and dry clean only.
I am very happy with my Hotel Living Blackout Lined Window Panels with Tieback.