In lord Buddha's daily routine, divided into five parts as follows.
- the morning session
- the afternoon session
- the first watch
- the middle watch (10.00 P.M. TO 2.00 A.M.)
- the last watch
So the 4th part is The Middle Watch, from 10.00 PM to 2.00 AM.
In that time Lord Buddha will answer the questions from "Devas", and these Devas come to see Buddha by flying Machine called "Wimanas" (or Vimana).
So my question is, does "Devas" here means Aliens? Did Aliens came to see Lord Buddha, and learn about Buddhism?