[Dreamer]

Hello! I am new to freediving and will be doing my AIDA** course in Greece in 1 months time. I have been practising my breath holds by lying on my bed and doing CO2 then O2 tables. At the end of the O2 table I held my breath for 3 and a half minutes which was longer then planned as I was watching the TV and not the clock! Is it safe to train alone like this? Abbi