Recently a user posted about posting at day is better than posting at night and asked for the suggestions so i can surely say that it is true with a proof as last night i published a post and only 1 post was published within 24 minutes and the next post which was published was again mine as you can see in pic.It was like only 3,4 members active at that time so  surely day is better but if members notice this and wanna make BBS 24 hours stable and active than they can contribute in this and can save some wuality contents and can publish them at night too but it is nearly impossible as most of the BBSers are sleeping at that time