Which type of effects does cannabis primarily exhibit at high doses?

At high doses, cannabis primarily exhibits a mixture of depressant and stimulative effects. These effects can create a range of responses in users, including relaxation, altered perception, and anxiety. High doses have been associated with increasing the likelihood of experiencing negative psychological effects, including paranoia and, in some cases, symptoms resembling psychosis.

The other options focus narrowly on just one type of effect. Anxiolytic effects, while present at some doses, are not the sole outcome of high cannabis use; they coexist with other effects as the dosage increases. Thus, saying that cannabis only exhibits anxiolytic effects ignores the broader spectrum of responses that may occur, particularly when higher levels are consumed. The assertion that there are only psychotic effects or only sleeping effects with high doses also overlooks the overall complexity of cannabis's interaction with the body and mind.

Therefore, the most accurate understanding is that cannabis at high doses presents a combination of effects that can vary widely among users, which is why the answer that acknowledges both depressant and stimulative effects is the most fitting.