Columbia subject headings:
Hallucinations and illusions in art--Congresses.
Hallucinations and illusions in literature--Congresses.
Hypnagogia--Congresses.
Sleep in art--Congresses.
Sleep in literature--Congresses.
Harvard subject headings:
Hallucinations and illusions in literature--Congresses.
Hypnagogia--Congresses.
Sleep in art--Congresses.
Sleep in literature--Congresses.
Princeton subject headings:
Hallucinations and illusions in art--Congresses.
Hallucinations and illusions in literature--Congresses.
Hypnagogia--Congresses.
Sleep in art--Congresses.
Sleep in literature--Congresses.