I appreciate the comments on this thread as it has helped me put into perspective what I've been going through.
Compared to many on this site, my symptoms are fairly mild but they are enough to sometimes disrupt my sleep and are generally an annoyance during the day. My research into the condition has led me to the following conclusions: the chances that fasciculations are an indication of a serious neurological condition such as ALS is extremely small, so small that it is not worth worrying about. There seems to be an almost infinite number of causes for it. I am exploring some of the possible causes relating to diet, vaccines, physical conditions such as sciatica (which I have had and can apparently affect nerves throughout the body, not just the legs and back), a thyroid imbalance, and a number of others. If I figure out what the cause of my fasciculations is I will be sure to post it here as it may help somebody. But I am also prepared for what many on this site have found: that there is no clear cause for the condition and you just have to do the best you can to live with it.