Sleep studies in Dogs

Comparision between Sleep-Wake cycle of Human and Dogs. @Bhagwati has collected data on sleep wake patterns of Dogs in Chattisgarh.
In night and afternoon time the dogs are found to be active in Chattisgarh (Blue line in graph). Similarly @Swaha collected data of dogs sleep wake pattern in Jalpaiguri, West Bengal (Red line in graph).
In case of Chattisgarh they are found to be sleeping around 7 hrs, and in Jalpaiguri, West Bengal they are sleeping for about 8 hrs. The duration of sleep wake pattern is same between Chattisgarh and Jalpaiguri, West Bengal but the timing is different.
However, between both the places, dogs wake up time is coinciding in afternoon and night time.