The other school of thought, the one I support, is that encouraging a somewhat regular sleep schedule for babies helps them sleep longer and more consistently. (get-your-baby-to-sleep.com)
The late and lengthy phone calls in different time zones put a strain on sleep schedules. (markreviewsmovies.com)
Speaking from personal experience, we have a consistent sleep schedule for my nearly 2 - year - old daughter, and we've been following it since she was 2 1/2 months old. (mindbodygreen.com)