Abiather, I asked for a specific and detailed explanation. You've provided precisely the opposite. Let's break it down..
The condition of your brain waves at the time of your deep sleep is called Delta Frequency.
OK, what, specifically, is that condition? You've not explained anything.
When you bring this frequency consciously during your wakeful stage is Delta Frequency Meditation.
How does one know they have reached it?
Meditation is concentrating on the gap between your thoughts (which is actually the talk of your mind), and widening it as far as possible to the extent of no thought happening.
Concentration is thinking really hard. You're saying you have to think to stop thinking, a contradiction. Explain how this works, please, with specific details and instructions.
Once you reached this stage, you get connected to your Supreme Source (God).
With no senses and your brain shut off, how is this communication happening? What is the medium and mode of transport? What type of signal is it? Be specific.