Suffocation in a dream means being unable to breath, and a feeling of being unable to progress or do any activity at all. It also signifies a period during which we feel trapped as if in a nightmare, not being able to rouse even for seconds.
Suffocation in a dream may also occur with one’s past actions or choices, which are becoming more difficult for the dreamer due to either guilt or regret. For example, a person who has caused others great pain in a past relationship is likely feeling the weight of their choices. If they continue to be troubled by it, the world of their dreams could generate feelings of fear and suffocation over time.