For low level players, awake is consumed at a lower rate per train.
For high level players, awake is consumed at a higher rate per train.
You are level 485+ so I would recommend refilling awake after each train to gain maximum stat/pt.
If you were level 191, it would cost 5 points to refill awake after each train. That same level 191 player could train 2 times before refilling awake and they would be able to receive close to max train the second train.
At your level, however, it would not be feasible to refill awake as a level 191 player would.