When you meditate you raise your energetic vibration. The raising of your vibration gives you the ability to enter different dimensions including the dimension of the afterlife. By meditating and increasing your vibration, your increased vibration remains with you even when you are not meditating, which is why the benefits of meditation are everlasting. It also means that your spiritual acuity and ability to engage with the spirit realm can take place at any time.
I must say, that during the physical act of meditation you may not have a spiritual engagement that you can articulate, although it is possible. The spiritual engagement will take place when you are ready to receive it.