Added weight and night back pain?

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Hey all! Quick question. I have been weight training for 2-3 years and I am wondering if I am experiencing inflammation at night while sleeping or having a larger issue due to incorrectly lifting or even possibly skeletal issues due to added weight gain. I went from an ectomorph build of 150 to 182. I don’t really remember back pain before weight training and i really focus on proper form not to hurt myself. Curious if anyone else is suffering night back pain when weight training and if any of these could be the cause??

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