If you are looking for a comfortable night train to the Northern Capital it is worth considering taking a private train. The cheerful Megapolis train leaves for St. Petersburg every night and offers a more hotel-like travel experience. After being shown to your cabin you will find your beds have already been made up with real duvets rather than blankets, and all round the carriages are spotless. You may buy breakfast and coffee in the morning and if at any moment during the trip you experience some problems you can call the train attendant! If you want to wake up in St. Petersburg truly fresh in the morning, it’s worth the money.
Trains leave Leningradsky station (metro Komsomolskaya) at 00:20 and arrive in St. Petersburg at 08:59. The schedule can change, please check it while purchasing the tickets online or by phone. 
For reservations call (+7) 800 777 20 19 or book online at www.poezdmegapolis.ru.