In fact, there are benefits to multiple light phases. (petbusiness.com)
In our early years of marriage, we always did colored lights, then I got into the all white lights phase. (theinspiredroom.net)
As adults we start off by falling into 2 lighter phases of sleep, followed by the deeper stage (non-REM), and then into our dream stage (REM) before starting all over again. (twinmom.com)