Yeah heard about it a few years back. At the time we just potty trained our oldest for the daytime. We kind of figured we’d have him continue bedtime diapers use for a while longer. Both our boys are potty trained now but we still have them (ages 6 and 8) still wear them to bed every night and usually if they ask on weekends or after school we let them go ahead. We made sure by time they were 7 that they knew how to diaper themselves and how to change if they’re wet. They’re a couple of exceptionally well behaved boys but we started this prior to them being in school and already get good grades. But, you do pose a good question. I have wondered if more parents are doing this.