Dear Hetal,
Since you have tried almost everything and received the best of suggestions form our experts, here's my question to you. Have you tried training your employees on their lifestyle?
Assuming that the employees in consideration have been working in the sector for last few years, they are supposed to find the sleep-balance . However, if this had not happened, are they under the life-cycle stage where they are almost living two-lives, utilising all their body strength during the day and falling asleep at night?
Please look deeper into the issues. If these employees have been productive and efficient at work other wise, certain degree of training by an health expert might help them improve upon their lives.
A firm where I worked we did see this pattern for a while, with a batch of employees. Right from the extra soda in the food at the cafeteria, we accounted all we could. When we observed it a little more, we found, since their cabs were registered early, they used to work out at the office gym, before the office hours. We discussed with an Health Expert and rescheduled the cabs for an extra hour towards the end of the day. This helped them work-out before they reached home, which is why they slept better and got up fresh for the office hours. Certain arrangements such as an hour break , mid way to the work day, for the ones who felt more active after working-out, did work wonders for us.