I just want to say milesprower has hit the nail on the head so to speak, I've been doing ssild for good few months and it does drop off with the success rate.. Until you figure out the reason it has stopped working.

That reason is because the first time people try this technique they wake up with a little excitement to try it which results in wakefulness which is very important to this technique also they follow the technique exactly how they read it and boom lucid dream, seemed so easy and it was, and the following attempts usually work out pretty well to. Until you try it again a few weeks later and it just isn't working.

I find this technique has a really high success rate for me and for alot of people but only when done r the right way, if you doze off too quickly during the cycles that will have a big impact on it working or not, also becoming lazy with your attention on each of your senses also has a big impact on success and lastly keeping a clear head as you are actually doing the cycle while at the same time being able to recognize a false awakening will have a big impact to and lastly having a good sleep schedule and not being too tired with lack of decent sleep.

So basically the way that it works almost everytime for me is-

-make sure to wake up enough to do the FULL CYCLE

-don't be too lazy with the technique, keep your attention/awareness fully on each sense

-have decent amount of sleep prior night/s and a good 4 hours before attempting.

-keep a clear head/don't over think it/don't count etc

If you tick all those boxes and still are not becoming lucid atleast 80% of the time I would be surprised but at the same time I do realize everyone is different for what works and what doesnt but this is my take on it.