These responses involve the following divisions of the nervous system:
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Waking up due to the alarm clock and smelling the coffee - Somatic Sensory (Somatic Nervous System)
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Stretching and yawning - Somatic Motor (Somatic Nervous System)
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Salivating - Autonomic (Parasympathetic) Nervous System
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Stomach rumbling - Enteric Motor System
Reference:
Tortora, G. J., & Derrickson, B. H. (2017). Tortora’s Principles of Anatomy & Physiology. Wiley.