As you might know, when you sleep, you go through a sleep cycle. Non-rem stages 1-3 and one REM.
Stage 1 and 2 are very light and you are aware of surroundings and have sense of time etc. Stage 3 is delta-slow wave sleep. It’s very deep. REM is when the most vivid dreams happen, but you can dream at any stage.
A sleep cycle usually lasts between 90 and 120 minutes. At the beginning of the night usually the cycles are shorter. What is probably happening is you are in stage 1 and 2 can and are aware of TV. Then you get into delta wave for some time (probably when you lose track of time) then when you get into REM the TV sounds loud again and wakes you up.
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