There is a Paid AC Lounge at PF 3(just beside the subway). The rate of stay is Rs 20 for 1 hour per person. If you have an UP train to catch(going to BBS, MAS, Mumbai etc), you can stay in this lounge for sometime. You can also stay here if you are catching a down train but be careful as down trains usually leaves from PF 7-8. This lounge is spacious and the toilets and bathrooms are also quite clean.