I have used the Internet at 3:00 a.m. , during the period known as Night Time. But my data usage record shows a data usage from my Anytime Data which starts only after 8:00 a.m. What would be the reason?

If the Night Time Bonus Data bundle is fully consumed, any usage from 12:00 midnight to 8 a.m. will be deducted from your available Anytime Data. Or, you still have capacity remaining in your Night Time Bonus Data, but Anytime Data usage of the previous day hasn’t been updated as the session ended before reaching 300MB , it will be updated at the end of the session. Hence you would see usage in the Anytime Data usage.