Expect it to be late on arr anyway, but once there at whatever time, you will not be able to stay long-most likely called to get out+up some time before.
Dont worry: such a major station, with a mile of shops/restrs and the like underneath it, will be buzzing with life also on that time-different countries, different habits. There is also a big LIDL supermarket at 1 end, and due to this strategic location being able to open sundays (and doing very good business) which has coffee machines for 1€-if they work. Or try Backwerk-a self-serve fresh bakery with dozens of all types of small breads/cakes and ditto for cf.