There are some mentioned somewhere that GN 10.1 2014 drains more battery while in sleep mode compare to iPad. Out of the box, between ipad and GN 10.1 2014, I agreed that ipad drains very little when in sleep. What people does not know is. IPad turns off wifi everytime when it goes to sleep. This saves a lot of power. All Mac laptops do the same. GN 10.1 2014 on the other hand ALWAYS has wifi on regardless. Which continues to drain battery while in sleep mode. The good news is. You can turn that off. While in seeting, wifi, click on menu button and select advanced. You can set the "KEEP WIFI ON DURING SLEEP" to never. This will save the power. With is setting, I see very little battery drian from my GN 10.1 2014 when in sleep for a long period.