We are suckers

Bedtime rituals begin at 7pm.

Lights out is at 7:30.

Occasionally if we're running late, it's closer to 7:45. But usually, we're pretty good about it.

Until a few nights ago when we were reading The Periodic Table: Elements with Style.  

Lights out was extended til 8.

Neither Jonathan nor I could stop reading.  It's so hard to put your foot down when children insist plaintively, "Just one more element!"