The present invention relates to a pillow for a sound sleep, in which the height and angle of a main body (20) contacting the head (1) and cervical vertebrae (2) of a user can be adjusted by a cervical vertebrae angle adjustment pad (30). The thus-configured pillow (10) for a sound sleep enables the height and angle of a required portion of the pillow (10) to be selectively adjusted in accordance with the shape and weight of the head, length and angle of the cervical vertebrae, etc., which vary among individuals. Thus, the pillow (10) tightly contacts and supports the cervical vertebrae (2) and the head (1) of the user to achieve the effects of ideally distributing the body pressure being applied to the head (1) and the cervical vertebrae (2) of the user. The height and angle of the pillow (10) can be adjusted in accordance with the shape and weight of the head, length and angle of the cervical vertebrae, etc., which vary among individuals, to achieve a customized personal pillow which is improved as compared to conventional techniques. In addition, the main body (20) has a front surface (25a) and a rear surface (25b) having a curvature (Rinner, Router) about the same center point (C), and the rear surface (25b) of the main body (20) has a width (L) located inside a top (3) of the head (1) of the user, to thereby effectively prevent the cervical vertebrae (2) of the user from being lifted when the upper portion of the head (1) of the user is brought into contact with the pillow (10). Further, the material (a low resilient body; preferably, memory foam) which forms an outer layer (21a) of the main body (20) has a hardness lower than that of the material (a highly resilient body; preferably, a highly resilient foam such as latex foam) which forms an inner layer (21b) of the main body (20), to thereby accomplish a further ideal distribution of body pressure. In addition, an upper surface (22) of the main body (20) has a curvature such that an intermediate portion (22a) of the upper surface (22), on which the cervical vertebrae (2) are disposed, has a front portion (26) lower than both side portions (22b) of the upper surface (22) of the main body (20), and a rear portion (28) of the intermediate portion (22a) becomes lower as it goes toward a lower surface (24) of the main body (20). Thus, the height of the pillow (10), which supports the head (1) and the cervical vertebrae (2) of the user, varies depending on the sleeping posture of the user. Therefore, the user may feel comfortable by the appropriate height and feeling of the pillow regardless of the sleeping posture when the user sleeps on the back or side thereof, and the height of the neck and the height of the head can be maintained at an optimum condition to prevent problems such as the slipping of a disc in the neck or the like which might occur around the cervical vertebrae, and to enable the pleasant sleep of the user.
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