if your train is coming at 2230, you will still need abt apprx 30 mts (this includes walk from train in platform, cross bridge, cross parking area and go to Ginger --another 15 mts for checkin procedures which leaves you with approx. 6 hrs to do the same work.) Its better to stay put at the railway retiring room for upper class, where the rush will be less.
My point is staying in Ginger will not leave you refreshed, since you have to take a train again next morning. if you further postpone your train journey, you can book in Ginger. else better is retiring room. Pl do not go to paharganj etc as going to the hotel, looking at rooms...
more... and coming back early morning will keep you occupied till the departure and no time to rest.
Option is entirely yours. thanks.