I was taught that when we memorized the Quran our daily habits n lifestyle will also enhance or decrease our memorization skills. Little sins like accidentally see kissing scenes n all that may erase our efforts. The first glance is often not charged as sin (but does not mean we can prolong our first glance) …but the second glance n more will. Also on social media the ads that potrayed sexy looking women n men can also affect our hifz. Games, instagram, tiktok n all the rampant myriad ads chosen for u may affect our hifz. Just look away n say astaghfirullah. But best not to even turn on the tv or gadgets at all unless its for good like reading the Quran online. Also when we choose to wake up for tahajjud , we may not be able to . Or we were not given the invitation. So all 5 senses have to be filtered .Have to be present and aware of what we do daily. And also, u may begin to notice that often what we think n say may manifest itself easily and effortlessly. So beware ...