Ejaculation is a condition for bathing to be obligatory , and basically ejaculation air is called nightmare. So bathing will not be obligatory on you in this situation. Because it has been narrated in the hadith that the Prophet (peace and blessings of Allaah be upon him) said , ' water is for water' (Muslim in the narration), that is, if ejaculation occurs, bathing will be obligatory , and if there is no ejaculation, bathing will not be obligatory.