I've recently had no success in getting lucid and I don't know why.

About 2 months ago I was having an average of 2 lucid dreams a week. Most of the time these dreams were very vivid and I had quite a good level of control. However in the last 3-4 weeks I have experienced no lucidity what so ever. For about a week and a half I couldn't recall a single dream but thankfully I'm back to having one or two reasonably vivid dreams a night but I am still unable to become lucid.
Normally I read through my dream journal a few times a week for inspiration and I will stick in pictures of things I want to dream about and I will visualize myself getting lucid. I normally do reality checks quite a few times a day. I try to meditate but most of the time I forget. So there is no real difference in my methods.
The only thing I can think of is I've done very little in the last 4 months. Due to health issues I have been declared unfit for work so I haven't been engaged in anything. Even though when I was back in college I was more busier and had more on my mind it provided me with more opportunities to observe my external world. Sat here I'm experiencing the same thing every day. Should I try more than simply reality checks? Are there any other methods people think are more appropriate right now? Does anyone else find that when they have lots of time away from work/college/school it actually hinders their ability to become lucid?
Thanks everyone.