Well, it is nothing to worry about, it its a matter of perception and state of mind, the better the trance the better the feeling. Keep doing it routinely and you will see that in time by the same mechanism you'll absorb energy and feel it in any trance or active state.
Don't doubt whatever you do, the secret is to make sure you do the best you can and to do it routinely. I guarantee you that in time you see progress and everyday you discover something new about meditation and self.
Not that it concerns in this case, but to be aware, with the foundation meditation and absorbing in general energy, power meditation, it is best to do it away of electronics, if you care about battery life or not short circuiting