Glad you asked me this question. This sleep scorecard had 16,000 respondents across India at the time of the data being published (March). Now, compared to Bangalore (5,000 respondents), Mumbai had only 1,500 respondents at the time. So essentially, only 2% of this group reported sleeping on time, or sleeping before 1a.m.
Even then, this is more than the sample size in the Godrej Interio survey, and even the annual global sleep survey Philips conducts (in its latest report, it only had 1,000 respondents across India).
As I've mentioned in the copy, one wouldn't be wrong in raising questions over surveys conducted by private companies - or surveys with limited sample sizes at the time of announcement. But this underlines the cold-shouldering of sleep deprivation research in India. It's telling that mattress and wearables companies, which have limited reach, are the only ones shedding *some* light on how we sleep. Never mind that most of these may be dipstick in nature; that there's no central concern over sleep deprivation is more problematic.
But coming back to Mumbai: Wakefit's survey is an ongoing one. It remains to be seen what their findings will be in 2020.