The context of the following conversation is Because Alex agreed to babysit his niece, he put her to bed at her normal bedtime.:
Alex says My sister asked me to babysit my niece!.
The friend responds Your niece?  I she the cute girl we saw yesterday?.
Alex responds Yes! she is so gentle I put her to bed at her normal bedtime.
The friend responds Ohh! she is a sleeping beauty..
Alex responds Thanks!.