Usually during the period between first project close-out and next project initiation, most of the team members of project have not much to perform except utilizing their time in non-visible activities. This could include personal web browsing, social sites, pending emails, thinking about improvisations, learning from past etc.
In an organization, management has to understand that if some of the teams of team members are sitting idle that does not mean they are useless. That means that they are undergoing revitalization phase. Surprisingly you will notice that by allowing teams/members to sleep at job when not at the peak of a project will generate an extra bounce of energy which can be utilized at the time when they jump into a project, especially when on a remote site during implementation phase. During this phase most of the team members don’t bother about time and pay their full energy into completion of project in as best possible manner as they can. And probably that energy, zeal and feeling comes from that period when they are allowed to relax.