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Something similar to this. Mine is a few years old.
Solar Charger, Anker 24W 3-Port USB Portable Solar Charger with Foldable CIGS Panel for Camping, PowerPort Solar for iPhone 12/SE/11/XS Max/XR/X/8, iPad, Samsung Galaxy S20/S10/S9/S8, and More https://www.amazon.com/dp/B08BYL2M9L/ref=cm_sw_r_cp_api_glt_i_7ABGJCE6QVNRGABFFM6B
A cheaper option initially would be to install "Sleep As Android" (https://play.google.com/store/apps/details?id=com.urbandroid.sleep) to see if your sleep is being interupted.
if you have an iphone i found this: https://sleepjunkies.com/sleep-apnea/best-iphone-apps/
Obstructive sleep apnea does have lifestyle factors too, so eating better (don't eat too late, avoid sugar and caffiene in the evenings), getting more exercise (even walking for 30mins a day would help) and maintaining regular sleep patterns all goes into it.
second hand machines may also be worn out and not provide adequate treatment.
good luck.