This sounds like a relatively straightforward issue — it seems that, at the current time, you are allotting too much time for sleep. As a result, you are often going to bed before you are sleepy enough for sleep — and this, as is to be expected, leads to sleep difficulties.
Then, the following night, because sleep drive is higher, you are able to sleep well.
Observing a more appropriate sleep window will likely lead to far more consistent sleep. Going to bed before sufficiently sleepy for sleep is very common among people with chronic insomnia — and is a primary perpetuating factor behind insomnia.
Just as we wouldn’t sit at the dinner table waiting to get hungry, we shouldn’t be getting into bed until we feel sleepy (which is not the same as feeling tired/fatigued).
You might find this page on sleep restriction helpful.
You might also find this video about sleep drive helpful.
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