Over the last decade or so, the logbook has been used in some resuscitation services in intubated patients, with the main objective of filling the "memory gap" mentioned by the intubated patients when they woke up and limiting the trauma associated with this Cut in the world corresponding to the sedation period. For this purpose, the use of a logbook in Hematology, by analogy with what is used in the resuscitation services, could be a means of limiting the psychological complications related to the allograft.