WBTB is used not for raising your awareness. Waking up after 6 hours and than going back to sleep again increases the chance of Lucid Dream, because REM period appears early in the morning. And, as we all know, vividly recalled dreams mostly occur during REM sleep.

You might think that it is not effecting your motivation, but it does. Every fail increases the amount of doubt in your mind. Don't worry about trying 4 times per week. There is still high possibilty that you will get Lucid Dream on your break days. It might be DEILD, MILD or DILD and I'm not making that up. There are a lot of statistics proving this fact.