please help my supply dropped overnight!

Veronica
My son went to bed at midnight and my boobs felt a little soft but he ate plenty. At 4:30 am when he woke to eat both my breast felt completely soft and he didn't seem to get anything. What can I do to get my supply back up? I don't know what I could have done for them to just go dry he's only 2.5 months old and I feed him every 2 hours. 
Please help