How to stop getting so hot while sleeping<br>Use air conditioning. The simplest way to keep your room cool while you sleep is to use your air conditioner if you have one. Central air or a portable window unit will both do the trick.
The context recommends getting portable fan
The statement is definitely incorrect, because the context only mentions using either a central air conditioner or a portable air conditioning unit. The system may have gotten this wrong, because I used the word "portable" or because there was no mention of the word "fan" in the context. 
( z1 recommend :ARG0 ( z2 context ) :ARG1 ( z3 get :ARG1 ( z4 fan :mod ( z5 portable ) ) ) )